Microsoft Office Communications Server 2007 R2 Web Trust Tool
Just released: OCS R2 Web Trust tool. The Web Trust Tool is a command-line tool (OCSWebIMTrust.exe) that can be used anytime there is a need to establish or remove a trusted sever entry for an Outlook Live server.
It works by searching the Active Directory and locating all instances of Outlook Live server or Exchange Client Access server. It then adds each server found to a list of trusted server entries, thus replacing the previous list of entries.
Get it here